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Replace compressor when there is no problem?

I had a A/C tech come over today for maintenance check up.
He think everything seems okay. I have new evaporator coil installed four years ago and change a filter almost every month during summer time.

However, after I told I had a trouble one a couple weeks ago with A/C that was not performing very well around 5-7 P.M . He says the compressor is very old and recommends me to replace the whole outside unit. He think it's an early sign of compressor failure. He suggested compressor start-up kit to help compressor work better or replace the whole outside unit.

I haven't had any problem with my A/C ever except for contactor once.
Should I replace the unit? It seem quite expensive to replace outside unit when it still works just fine normally except one case.

Currently I have Good man 3/5 ton outside unit that was installed in 1991, new evaporator coil (carrier) was installed 3 years ago. I am located in Garland, Texas

The A/C unit suggested is Tappin ( I haven't seen this brand before) 4 ton keeping the evaportor coil in attic.

If you replace the outdoor unit you would need to replace the indoor coil also. Systems come as a matched set and there is no way of knowing otherwise what you might be getting.

That being said, did the tech diagnosis a problem with the unit or is he just guessing off of what you said? If the compressor is starting ok then there should be no need for a hard start. Did they check the amperage to see if it was high? If they said everything was ok then why the need for a new unit?

With a 17 year old unit it is time to start thinking about a new system but you should not need to jump into anything quickly. Get some competive bids from good contractors and start saving for a system.

If you do get a new A/C.
You don't want a Tappan condenser on a Carrier coil.
You won't get teh efficiency or capacity.
Plus, Tappan won't honor the compressor warranty if you mix and match with non ARI approved matches.